/*
   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
   2011, 2012 Her Majesty the Queen in Right of Canada (Communications
   Research Center Canada)

   Copyright (C) 2015
   Matthias P. Braendli, matthias.braendli@mpb.li

   Implementation of the FIG carousel to schedule the FIGs into the
   FIBs.
   */
/*
   This file is part of ODR-DabMux.

   ODR-DabMux is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as
   published by the Free Software Foundation, either version 3 of the
   License, or (at your option) any later version.

   ODR-DabMux is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with ODR-DabMux.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "fig/FIGCarousel.h"
#include <boost/format.hpp>
#include <iostream>
#include <deque>

namespace FIC {

/**************** FIGCarouselElement ****************/
void FIGCarouselElement::reduce_deadline()
{
    deadline -= 24; //ms

    std::cerr << "FIG " << fig->name() <<
        " deadline decreased to: " << deadline << std::endl;

    if (deadline < 0) {
        std::cerr << "FIG " << fig->name() <<
            " has negative scheduling deadline" << std::endl;
    }
}

void FIGCarouselElement::increase_deadline()
{
    deadline = rate_increment_ms(fig->repetition_rate());

    std::cerr << "FIG " << fig->name() <<
        " deadline increased to: " << deadline << std::endl;
}


/**************** FIGCarousel *****************/

FIGCarousel::FIGCarousel(boost::shared_ptr<dabEnsemble> ensemble) :
    m_rti(ensemble),
    m_fig0_0(&m_rti),
    m_fig0_1(&m_rti),
    m_fig0_2(&m_rti),
    m_fig0_3(&m_rti),
    m_fig0_17(&m_rti)
{
    m_figs_available[std::make_pair(0, 0)] = &m_fig0_0;
    m_figs_available[std::make_pair(0, 1)] = &m_fig0_1;
    m_figs_available[std::make_pair(0, 2)] = &m_fig0_2;
    m_figs_available[std::make_pair(0, 3)] = &m_fig0_3;
    m_figs_available[std::make_pair(0, 17)] = &m_fig0_17;

    const int fib0 = 0;
    allocate_fig_to_fib(0, 0, fib0);
    allocate_fig_to_fib(0, 1, fib0);
    allocate_fig_to_fib(0, 2, fib0);
    allocate_fig_to_fib(0, 3, fib0);
    allocate_fig_to_fib(0, 17, fib0);
}

void FIGCarousel::update(unsigned long currentFrame, time_t dabTime)
{
    m_rti.currentFrame = currentFrame;
    m_rti.date = dabTime;
}

void FIGCarousel::allocate_fig_to_fib(int figtype, int extension, int fib)
{
    if (fib < 0 or fib >= 3) {
        throw std::out_of_range("Invalid FIB");
    }

    auto fig = m_figs_available.find(std::make_pair(figtype, extension));

    if (fig != m_figs_available.end()) {
        FIGCarouselElement el;
        el.fig = fig->second;
        el.deadline = 0;
        el.increase_deadline();
        m_fibs[fib].push_back(el);
    }
    else {
        std::stringstream ss;
        ss << "No FIG " << figtype << "/" << extension << " available";
        throw std::runtime_error(ss.str());
    }
}

void dumpfib(const uint8_t *buf, size_t bufsize) {
    std::cerr << "FIB ";
    for (size_t i = 0; i < bufsize; i++) {
        std::cerr << boost::format("%02x ") % (unsigned int)buf[i];
    }
    std::cerr << std::endl;
}

size_t FIGCarousel::carousel(
        size_t fib,
        uint8_t *buf,
        const size_t bufsize,
        int framephase)
{
    uint8_t *pbuf = buf;

    std::list<FIGCarouselElement>& figs = m_fibs[fib];

    std::cerr << "fib" << fib << "(framephase=" << framephase << ")" << std::endl;

    std::deque<FIGCarouselElement*> sorted_figs;

    /* Decrement all deadlines */
    for (auto& fig_el : figs) {
        fig_el.reduce_deadline();

        sorted_figs.push_back(&fig_el);
    }

    /* Sort the FIGs in the FIB according to their deadline */
    std::sort(sorted_figs.begin(), sorted_figs.end(),
            []( const FIGCarouselElement* left,
                const FIGCarouselElement* right) {
            return left->deadline < right->deadline;
            });

    std::cerr << "  Sorted figs:" << std::endl;
    for (auto& fig_el : sorted_figs) {
        std::cerr << "    " << fig_el->fig->name() <<
            " d:" << fig_el->deadline << std::endl;
    }

    /* Data structure to carry FIB */
    size_t available_size = bufsize;

    /* Take special care for FIG0/0 */
    auto fig0_0 = find_if(sorted_figs.begin(), sorted_figs.end(),
            [](const FIGCarouselElement* f) {
            std::cerr << "Check fig " << f->fig->name() << " " <<
                rate_increment_ms(f->fig->repetition_rate()) << std::endl;
            return f->fig->repetition_rate() == FIG_rate::FIG0_0;
            });

    if (fig0_0 != sorted_figs.end()) {
        sorted_figs.erase(fig0_0);

        if (framephase == 0) { // TODO check for all TM
            FillStatus status = (*fig0_0)->fig->fill(pbuf, available_size);
            size_t written = status.num_bytes_written;
            std::cerr << "Special FIG 0/0 wrote " <<
                written << " bytes" << std::endl;

            if (written > 0) {
                available_size -= written;
                pbuf += written;
            }
            else {
                throw std::runtime_error("Failed to write FIG0/0");
            }

            if (status.complete_fig_transmitted) {
                (*fig0_0)->increase_deadline();
            }
        }
    }


    /* Fill the FIB with the FIGs, taking the earliest deadline first */
    while (available_size > 0 and not sorted_figs.empty()) {
        auto fig_el = sorted_figs[0];
        FillStatus status = fig_el->fig->fill(pbuf, available_size);
        size_t written = status.num_bytes_written;

        std::cerr << "   FIG " << fig_el->fig->name() <<
           " wrote " << written << " bytes" << std::endl;

        if (written > 0) {
            available_size -= written;
            pbuf += written;
        }

        if (status.complete_fig_transmitted) {
            fig_el->increase_deadline();
        }

        sorted_figs.pop_front();
    }

    dumpfib(buf, bufsize);

    return bufsize - available_size;
}

} // namespace FIC